package org.openclinic.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SessionControlFilter implements Filter {

	private FilterConfig filterConfig;
	
	@Override
	public void destroy() {
		filterConfig = null;
	}
	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		HttpSession session = httpRequest.getSession();
		String path = httpRequest.getServletPath();
	
		if (!path.equals("/index.do") && !path.equals("/auth.do") && session.getAttribute("currentUser") == null) {
			session.invalidate();
			((HttpServletResponse)response).sendRedirect(httpRequest.getContextPath() + "/index.do");
			return;
		}

		filterChain.doFilter(request, response);
	}

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;		
	}
	
}
